diff --git a/Cargo.toml b/Cargo.toml
index 7f6213c..6bee891 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,7 +14,7 @@ edition = "2018"
 
 [package.metadata.docs.rs]
 default-target = "x86_64-pc-windows-msvc"
-features = ["nightly"]
+features = ["beta"]
 targets = ["aarch64-pc-windows-msvc", "i686-pc-windows-msvc", "x86_64-pc-windows-msvc"]
 
 [dependencies.winapi]
@@ -27,4 +27,5 @@ func-types = []
 impl-default = ["winapi/impl-default"]
 user = []
 kernel = []
-nightly = []
+beta = []
+nightly = ["beta"]
\ No newline at end of file
diff --git a/README.md b/README.md
index 10ddf45..7ae73ee 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 Rust FFI bindings for Native API. Mostly based on Process Hacker [phnt](https://github.com/processhacker/processhacker/tree/master/phnt) headers as the most complete source of bindings to be found. The comments there also contain useful information on how to use specific things.
 
 ### Minimum supported Rust
-Always the latest stable. Some [features][docs_link] require a nightly compiler.
+Always the latest stable. Some [features][docs_link] require a beta compiler.
 
 [travis_link]: https://travis-ci.org/MSxDOS/ntapi
 [travis_badge]: https://travis-ci.org/MSxDOS/ntapi.svg?branch=master
diff --git a/src/lib.rs b/src/lib.rs
index e6cd5fa..30c5458 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -3,7 +3,7 @@
 //! **`impl-default`** -- Implement [`Default`] for structs and unions.<br/>
 //! **`user`** *(default)* -- Link to `ntdll`.<br/>
 //! **`kernel`** -- Link to `ntoskrnl` on MSVC targets.<br/>
-//! **`nightly`** --  Unlock unstable features that require a nightly compiler:
+//! **`beta`** --  Unlock unstable features that require a beta compiler:
 //! - [`NtCurrentTeb`]
 //! - [`__readfsdword`]
 //! - [`__readgsqword`]
@@ -30,7 +30,6 @@
 #![deny(unused, unused_qualifications)]
 #![warn(unused_attributes)]
 #![allow(bad_style, overflowing_literals, unused_macros, clippy::cast_lossless, clippy::cast_ptr_alignment, clippy::len_without_is_empty, clippy::trivially_copy_pass_by_ref, clippy::unreadable_literal)]
-#![cfg_attr(feature = "nightly", feature(llvm_asm))]
 #[doc(hidden)]
 pub extern crate core as _core;
 #[macro_use]
diff --git a/src/ntpsapi.rs b/src/ntpsapi.rs
index 938d2ee..b2ba28a 100644
--- a/src/ntpsapi.rs
+++ b/src/ntpsapi.rs
@@ -19,7 +19,7 @@ use winapi::um::winnt::{
     PROCESS_MITIGATION_STRICT_HANDLE_CHECK_POLICY, PROCESS_MITIGATION_SYSTEM_CALL_DISABLE_POLICY,
     PROCESS_MITIGATION_SYSTEM_CALL_FILTER_POLICY, PSECURITY_QUALITY_OF_SERVICE,
 };
-#[cfg(all(feature = "nightly", not(target_arch = "aarch64")))]
+#[cfg(all(feature = "beta", not(target_arch = "aarch64")))]
 use crate::winapi_local::um::winnt::NtCurrentTeb;
 pub const GDI_HANDLE_BUFFER_SIZE32: usize = 34;
 pub const GDI_HANDLE_BUFFER_SIZE64: usize = 60;
@@ -932,7 +932,7 @@ pub const NtCurrentThread: HANDLE = -2isize as *mut c_void;
 pub const ZwCurrentThread: HANDLE = NtCurrentThread;
 pub const NtCurrentSession: HANDLE = -3isize as *mut c_void;
 pub const ZwCurrentSession: HANDLE = NtCurrentSession;
-#[inline] #[cfg(all(feature = "nightly", not(target_arch = "aarch64")))]
+#[inline] #[cfg(all(feature = "beta", not(target_arch = "aarch64")))]
 pub unsafe fn NtCurrentPeb() -> PPEB {
     (*NtCurrentTeb()).ProcessEnvironmentBlock
 }
@@ -940,11 +940,11 @@ pub const NtCurrentProcessToken: HANDLE = -4isize as *mut c_void;
 pub const NtCurrentThreadToken: HANDLE = -5isize as *mut c_void;
 pub const NtCurrentEffectiveToken: HANDLE = -6isize as *mut c_void;
 pub const NtCurrentSilo: HANDLE = -1isize as *mut c_void;
-#[inline] #[cfg(all(feature = "nightly", not(target_arch = "aarch64")))]
+#[inline] #[cfg(all(feature = "beta", not(target_arch = "aarch64")))]
 pub unsafe fn NtCurrentProcessId() -> HANDLE {
     (*NtCurrentTeb()).ClientId.UniqueProcess
 }
-#[inline] #[cfg(all(feature = "nightly", not(target_arch = "aarch64")))]
+#[inline] #[cfg(all(feature = "beta", not(target_arch = "aarch64")))]
 pub unsafe fn NtCurrentThreadId() -> HANDLE {
     (*NtCurrentTeb()).ClientId.UniqueThread
 }
diff --git a/src/ntrtl.rs b/src/ntrtl.rs
index afbbb16..9dfa19f 100644
--- a/src/ntrtl.rs
+++ b/src/ntrtl.rs
@@ -2196,7 +2196,7 @@ EXTERN!{extern "system" {
         MakeReadOnly: BOOLEAN,
     );
 }}
-#[inline] #[cfg(all(feature = "nightly", not(target_arch = "aarch64")))]
+#[inline] #[cfg(all(feature = "beta", not(target_arch = "aarch64")))]
 pub unsafe fn RtlProcessHeap() -> PVOID {
     use crate::ntpsapi::NtCurrentPeb;
     (*NtCurrentPeb()).ProcessHeap
@@ -2944,13 +2944,13 @@ EXTERN!{extern "system" {
 }}
 #[inline]
 pub unsafe fn RtlCheckBit(BitMapHeader: &RTL_BITMAP, BitPosition: ULONG) -> u8 {
-    #[cfg(all(target_arch = "x86_64", feature = "nightly"))] {
+    #[cfg(all(target_arch = "x86_64", feature = "beta"))] {
         use crate::winapi_local::um::winnt::_bittest64;
         _bittest64(BitMapHeader.Buffer as *const i64, BitPosition as i64)
     }
     #[cfg(any(
         target_arch = "x86",
-        all(target_arch = "x86_64", not(feature = "nightly")),
+        all(target_arch = "x86_64", not(feature = "beta")),
         target_arch = "aarch64",
     ))] {
         (*BitMapHeader.Buffer.offset(BitPosition as isize / 32) >> (BitPosition % 32) & 1) as u8
diff --git a/src/winapi_local/um/winnt.rs b/src/winapi_local/um/winnt.rs
index 66a4c2a..653adf9 100644
--- a/src/winapi_local/um/winnt.rs
+++ b/src/winapi_local/um/winnt.rs
@@ -1,3 +1,5 @@
+#[cfg(all(feature = "beta", not(target_arch = "aarch64")))]
+use core::arch::asm;
 use winapi::shared::basetsd::{DWORD64, SIZE_T, ULONG64};
 use winapi::shared::minwindef::DWORD;
 use winapi::um::winnt::{HANDLE, PVOID};
@@ -6,40 +8,36 @@ use winapi::um::winnt::{HANDLE, PVOID};
 pub const fn UInt32x32To64(a: u32, b: u32) -> u64 {
     a as u64 * b as u64
 }
-#[cfg(all(feature = "nightly", not(target_arch = "aarch64")))]
+#[cfg(all(feature = "beta", not(target_arch = "aarch64")))]
 IFDEF!{
 use crate::ntpebteb::TEB;
 #[inline]
 pub unsafe fn _bittest64(Base: *const i64, Offset: i64) -> u8 {
     let out: u8;
-    llvm_asm!("bt $1, $2; setb $0"
-    : "=r"(out)
-    :  "*m"(Base), "r"(Offset)
-    : "cc"
-    : "intel"
-    );
+    asm!(
+        "bt {1}, {2}",
+        "setb {0}",
+        out(reg_byte) out,
+        in(reg) Base,
+        in(reg) Offset);
     out
 }
 #[inline]
 pub unsafe fn __readfsdword(Offset: DWORD) -> DWORD {
     let out: u32;
-    llvm_asm!("mov $0, fs:[$1]"
-    : "=r"(out)
-    : "ri"(Offset)
-    :
-    : "intel"
-    );
+    asm!(
+        "mov {0:e}, fs:[{1:e}]",
+        out(reg) out,
+        in(reg) Offset);
     out
 }
 #[inline]
 pub unsafe fn __readgsqword(Offset: DWORD) -> DWORD64 {
     let out: u64;
-    llvm_asm!("mov $0, gs:[$1]"
-    : "=r"(out)
-    : "ri"(Offset)
-    :
-    : "intel"
-    );
+    asm!(
+        "mov {0}, gs:[{1:e}]",
+        out(reg) out,
+        in(reg) Offset);
     out
 }
 #[inline] #[allow(unused_unsafe)]